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graphs that can be embedded into the plane, i.e. that can be drawn without crossings between the lines representing edges.

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Can all crossings in a graph be moved to one point?

Consider a graph $G$ with at least two unavoidable crossings, say, the disjoint union of two copies of $K_5$. Can such a graph always be drawn so that there is only one singular point (where all cross …
Hauke Reddmann's user avatar